1COR 1:17. For Christ sent me not to baptize, but to preach the gospel: not with wisdom of words, lest the cross of Christ should be made of none effect.

1COR 2:1. And I, brethren, when I came to you, came not with excellency of speech or of wisdom, declaring unto you the testimony of God.

1COR 2:2. For I determined not to know any thing among you, save Jesus Christ, and him crucified.

1COR 2:4. And my speech and my preaching was not with enticing words of man's wisdom, but in demonstration of the Spirit and of power:

1COR 14:9. So likewise ye, except ye utter by the tongue words easy to be understood, how shall it be known what is spoken? for ye shall speak into the air.

2COR 1:12. For our rejoicing is this, the testimony of our conscience, that in simplicity and godly sincerity, not with fleshly wisdom, but by the grace of God, we have had our conversation in the world, and more abundantly to you-ward.